A Rapid Evaluation Method for Creep Properties of Directionally Solidified Nickel-Based Alloy DZ411

CAO Tieshan; CHEN Qiao; WANG Wei; CHI Qingxin; CHENG Congqian; ZHAO Jie

doi:10.11973/jxgccl202307009

Materials and Mechanical Engineering > 2023 > 47(7): 55-61. > DOI: 10.11973/jxgccl202307009

CAO Tieshan, CHEN Qiao, WANG Wei, CHI Qingxin, CHENG Congqian, ZHAO Jie. A Rapid Evaluation Method for Creep Properties of Directionally Solidified Nickel-Based Alloy DZ411[J]. Materials and Mechanical Engineering, 2023, 47(7): 55-61. DOI: 10.11973/jxgccl202307009

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A Rapid Evaluation Method for Creep Properties of Directionally Solidified Nickel-Based Alloy DZ411

1. School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China;
2. AECC Shenyang Engine Research Institute, Shenyang 110015, China

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Received Date: February 28, 2022
Revised Date: March 12, 2023

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Abstract

Effects of pre-strains (0.5%, 1.0%, 1.5%, 2.0%, 2.5%), loading strain rates (4.0×10^-5, 1.2×10^-4, 4.0×10^-4 s^-1) and initial temperatures (750, 900 ℃) of continuous temperature stress relaxation tests on directionally solidified nickel-based alloy DZ411 were studied. Based on steady-state deformation obtained by dynamic equilibrium of work hardening and recovery softening, assuming that the change of the steady-state relaxation strain rate with stress was consistent with that of the minimum creep rate of the traditional creep rupture test, the minimum creep rate was predicted and verified by short-term stress relaxation tests. The results show that the test alloy was relaxed when the work hardening and recovery softening were in dynamic equilibrium. When the pre-strain was not less than 1.0%, the steady-state relaxation could be quickly achieved. The initial temperature had little effect on the steady-state relaxation behavior. The loading strain rate affected the initial relaxation strain rate, but had little effect on the change of steady-state relaxation strain rate with stress. The minimum creep rates under different temperatures and stresses could be predicted by the master curve of steady-state relaxation strain rate. The creep rupture test results were located in the range of 99% reliable curve of the master curve of steady-state relaxation strain rate.
- directional solidified nickel-based alloy,
- stress relaxation test,
- creep,
- minimum creep rate,
- relaxation strain rate

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